package com.zsl.service.impl;

import com.alibaba.fastjson.JSON;
import com.zsl.service.FileService;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.PrintWriter;
import java.util.*;

public class FileServiceImpl implements FileService {
    // 上传文件存储目录
    private static final String UPLOAD_DIRECTORY = "book";
    // 上传配置
    private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3;  // 3MB
    private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
    private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
    @Override
    public String uploadJPGEFile(HttpServletRequest request) throws Exception {
        String image=null;
        Map<String,Object> result=new HashMap<>();
        // 检测是否为多媒体上传
        if (!ServletFileUpload.isMultipartContent(request)) {
            return null;
        }
        // 配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();
        // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
        factory.setSizeThreshold(MEMORY_THRESHOLD);
        // 设置临时存储目录
        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

        ServletFileUpload upload = new ServletFileUpload(factory);
        // 设置最大文件上传值
        upload.setFileSizeMax(MAX_FILE_SIZE);
        // 设置最大请求值 (包含文件和表单数据)
        upload.setSizeMax(MAX_REQUEST_SIZE);
        // 中文处理
        upload.setHeaderEncoding("UTF-8");
        // 构造临时路径来存储上传的文件
        // 这个路径相对当前应用的目录
        //读取配置信息
        ResourceBundle resource = ResourceBundle.getBundle("webConfig");
        String imgDirPath = resource.getString("staticFilepath.img");
        String rootDirPath = resource.getString("staticFilepath.root");

        String uploadPath = rootDirPath + imgDirPath + "\\" + UPLOAD_DIRECTORY;
//        System.out.println(uploadPath);
//        System.out.println(request.getServletContext().getRealPath("./"));
//        System.out.println(File.separator);
//        System.out.println(UPLOAD_DIRECTORY);
        // 如果目录不存在则创建
        File uploadDir = new File(uploadPath);
        if (!uploadDir.exists()) {
            uploadDir.mkdir();
        }
        // 解析请求的内容提取文件数据
        List<FileItem> formItems = upload.parseRequest(request);
        //正确的读取表单
        if (formItems != null && ((List<?>) formItems).size() > 0) {
            // 迭代表单数据
            for (FileItem item : formItems) {
                // 处理不在表单中的字段
                if (!item.isFormField()) {
                    // 修改具体内容
                    //String fileName = new File(item.getName()).getName();
                    image = UUID.randomUUID().toString() + ".jpg";
                    String filePath = uploadPath + File.separator + image;
                    File storeFile = new File(filePath);
                    // 在控制台输出文件的上传路径
                    System.out.println(filePath);
                    //  保存文件到硬盘
                    item.write(storeFile);
                }
            }
        }
        return image;
    }
}
